World’s first underground park - Two designers inspired by a previous New York City park want to turn an abandoned streetcar terminal into an underground public space. NYC doesn’t have a lot of open space for creating new viable parks. In 1999, residents proposed renovating an abandoned rail line and turning it into a park. In 2006, construction began on “High Line”, which is built on an elevated railway that runs for about 16 blocks, with elevator access and street entrances along the way.